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Re: [Ace] WGLC review of draft-ietf-ace-mqtt-tls-profile-07

Olaf Bergmann <bergmann@tzi.org> Tue, 29 September 2020 20:29 UTC

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From: Olaf Bergmann <bergmann@tzi.org>
To: Seitz Ludwig <ludwig.seitz@combitech.se>
Cc: Ace Wg <ace@ietf.org>
References: <D68C212C-FD3A-4900-86DE-B138DD0CFCD0@ericsson.com> <CAA7SwCPQjY7fwJrJyfK=kmcmPP3i-6mevwP+64yjc4S_8ezoww@mail.gmail.com> <06BB230C-FEDF-46F2-8B54-525BD9675A27@ericsson.com> <a5a83e6943cb4f2f8ee8dde4cd987b7e@combitech.se>
Date: Tue, 29 Sep 2020 22:29:16 +0200
In-Reply-To: <a5a83e6943cb4f2f8ee8dde4cd987b7e@combitech.se> (Seitz Ludwig's message of "Thu, 24 Sep 2020 13:37:20 +0000")
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Subject: Re: [Ace] WGLC review of draft-ietf-ace-mqtt-tls-profile-07
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Hi Ludwig,

Seitz Ludwig <ludwig.seitz@combitech.se> writes:

> “ace_profile” parameter in the access token request. 
>
>  the only option for the client is [...] to send an empty
> “ace_profile” parameter in the access token request in order to query
> the selected profile

I just stumbled over Section 5.6.3, Error Response [1], which describes
the error code incompatible_ace_profiles as follows:

     "If the client and the RS it has requested an access token for do
     not share a common profile, the AS MUST reject that request with a
     response code equivalent to the CoAP code 4.00 (Bad Request)
     including the error code "incompatible_ace_profiles" defined in
     Figure 10."

I wonder how the AS is supposed to know which ace profiles the client
implements?

[1] https://tools.ietf.org/rfcmarkup?doc=draft-ietf-ace-oauth-aut#section-5.6.3

Grüße
Olaf

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